whats the main difference between the first look sensor and the first look diagnostic injector sensor?

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Answers

There are two Firstlook units: The BLACK unit (AES# sx-100) and the RED unit (AES# sx-300).

The BLACK unit is more sensitive than the RED unit.

The BLACK unit is built for low pressure environments such as: intake, exhaust, oil pan; and is very sensitive. This is the most popular one we sell.

The RED unit is designed specifically for high pressures of Return and Returnless systems (not GDI) and is built to withstand direct contact with fuels. NOTE: We don’t recommend any pressure measuring device on GDI systems whose pressures are very high and very dangerous.